Midea SMK-60/CGN8, Руководство по обслуживанию

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M‐Thermal Split
68 201909
Midea M‐Thermal Split Ser
vice Manual
Refrigerant System, Inverter Module").
2. Backup electric heater water outlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN6 on the
hydronic box main PCB (labeled 11 in Figure 4‐2.1 in Part4, 2.2 "Main PCB for Hydronic System").
Domestic hot water tank temperature sensor connection
is port CN13 on hydronic box main PCB (labeled 12 in Figure 4‐2.1 in Part4, 2.2 "Main PCB for Hydronic System").
3. Measure sensor resistance. If the resistance is too low, the sensor has short‐circuited. If the resistance is not consistent with the sensor’s resistance
characteristics table, the sensor has failed. Refer to Part 2, 1 “Layout of Functional Components” and to Table 5‐5.1 or 5‐5.2 in Part 5, 5.1 “Temperature
Sensor Resistance Characteristics”.
4. High pressure switch connection is port CN13 on the main PCB (labeled 10 in Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System, Inverter
Module"). Pressure sensor connectin is port CN4 on the main control board (labeled 15 in Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System,
Inverter Module")
5. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor
has failed.
6. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to
be lower than normal.
7. Check air side heat exchanger, fan and air outlets for dirt/blockages.
8. Check the water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.
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